EP0501179B1 - Vorrichtung zum Erwärmen von medizinischen Flüssigkeiten - Google Patents

Vorrichtung zum Erwärmen von medizinischen Flüssigkeiten Download PDF

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Publication number
EP0501179B1
EP0501179B1 EP92101774A EP92101774A EP0501179B1 EP 0501179 B1 EP0501179 B1 EP 0501179B1 EP 92101774 A EP92101774 A EP 92101774A EP 92101774 A EP92101774 A EP 92101774A EP 0501179 B1 EP0501179 B1 EP 0501179B1
Authority
EP
European Patent Office
Prior art keywords
temperature
temperature sensor
metal tube
tube
flow
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP92101774A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0501179A1 (de
Inventor
Hans-Gerd Evering-Hattisch
Walter Hansen
Hans-Peter Schneider
Hans-Dietrich Dr. Polaschegg
Bernd Dr. Steinbach
Monika Peter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fresenius SE and Co KGaA
Original Assignee
Fresenius SE and Co KGaA
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Filing date
Publication date
Application filed by Fresenius SE and Co KGaA filed Critical Fresenius SE and Co KGaA
Publication of EP0501179A1 publication Critical patent/EP0501179A1/de
Application granted granted Critical
Publication of EP0501179B1 publication Critical patent/EP0501179B1/de
Anticipated expiration legal-status Critical
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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/44—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests having means for cooling or heating the devices or media
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2205/00—General characteristics of the apparatus
    • A61M2205/36—General characteristics of the apparatus related to heating or cooling
    • A61M2205/3653—General characteristics of the apparatus related to heating or cooling by Joule effect, i.e. electric resistance

Definitions

  • the invention relates to a device for heating medical liquids with a U-shaped metal tube, an electrical energy source and with a heating control unit according to WO-A-90/07947.
  • the liquid to be heated can be passed through a bag with a meandering liquid guide, the bag being arranged between two electrically heated plates which heat the bag to a predetermined temperature (US Pat. No. 4,098,123).
  • Another principle is the use of a plate heating device in which a hose is placed around a cylindrical winding body instead of the bag to be heated.
  • the winding body is provided with a circumferential spiral recess in which the tube with the appropriate diameter can be inserted.
  • Engström Medical AB sells a heating device which has a directly heatable stainless steel tube through which the medical fluid to be heated, in particular a substituate solution, is passed.
  • U-shaped tube which is heated by a separate heating element.
  • the U-shaped tube consists of an aluminum alloy, in which the inner wall is provided with a special coating (aluminum Telfa) in order to increase heat conduction from the heating element via the U-shaped tube to the liquid flowing through the tube.
  • the object of the present invention is to develop a generic device such that a predetermined liquid temperature at constant and changing flow rates between almost 0 and 250 ml / min. is achieved.
  • a predetermined liquid temperature for example about 37 ° C.
  • ⁇ 1%) even with changing high flow rates as well as with very low flow rates. This ensures that the liquid does not change its substance during transport due to the heating.
  • the respective liquid is heated during application as it flows through the metal tube.
  • This tube is heated electrically, being connected to an AC power source.
  • the thermal energy required to heat a liquid results from the following input variables: volume flow, ACTUAL and TARGET temperature and heat capacity of the liquid. Based on these input variables, the current and voltage values result depending on the electrical resistance of the heating pipe. For safety reasons, these sizes are advantageously kept as small as possible.
  • a tube with the smallest possible wall thickness for example approximately 0.1 mm, is selected. On the one hand, this wall thickness results in a sufficiently large electrical resistance per unit length and, on the other hand, ensures that the pipe is machined in the direction of shaping.
  • the heating tube used according to the invention has a heat capacity of less than 2.5 J / K.
  • the tube used is about 60 cm long and has an inside diameter of about 3 mm.
  • the heating tube used is bent in a U-shape and in the example has a bending radius of about 4 cm, the legs of the U-shaped Pipe are approximately the same length and are arranged parallel to each other.
  • a physiologically harmless material is used as the material for the tube, for example stainless steel, titanium and the like, which is also inert to corrosive sterilization media.
  • a cold drawn stainless steel semi-finished product is advantageously used as the pipe material, the wall thickness preferably being maintained at ⁇ 10%.
  • such a tube ensures a uniform temperature profile, the highest temperature value being achieved at the downstream end of the tube on the inner wall surface of the tube.
  • flow forms laminar or turbulent flow
  • the tube is U-shaped, as explained above. This creates a secondary flow in the area of the pipe bend, which improves the convective heat conduction.
  • the heating tube is machined on the straight legs, ie the straight partial areas, in such a way that it has a raised shape on the inner surface.
  • the raised shape is advantageous formed spirally, which is generated in that a helical bead is pressed from the outside into the tube wall. This bead then creates a spiral indentation / elevation in the interior of the tube, as a result of which the parallel paths of the liquid particles are broken in the case of laminar flow.
  • This spiral, raised form is advantageously continued at the end regions or in the regions of the legs at which sensors for determining the temperature are arranged. This is to ensure reliable temperature measurement due to the improved heat transport after leaving the active heating zone.
  • 10 is a metal heating tube, which is U-shaped.
  • This heating tube 10 consists of an inflow leg 12, a U-shaped region 14 adjoining the inflow leg 12 and the adjoining outflow leg 16.
  • Both legs 12 and 16 are of approximately the same length and have a bead region 18 or 20 which is of spiral design and leaves a raised spiral structure 22 on the inside of the tube, as shown in the detail from FIG. 1.
  • View A is a longitudinal sectional view through the outflow leg 16, showing a half turn of the raised structure 22.
  • FIG. 2 shows the installation of the heating tube 10 in an operating unit 24, the connecting lines for supplying and discharging the liquid to be heated not being shown for reasons of clarity.
  • the inflow leg 12 has in its inflow region 26 a first temperature sensor 28 with which the temperature of the inflowing liquid is determined.
  • contact pins 34 and 36 are provided on the two legs, with which the quality of the electrical connection, the correct position and the intended electrical resistance of the tube 10 can be determined.
  • a second temperature sensor 38 is provided, with which the maximum pipe wall temperature can be determined and monitored.
  • a third temperature sensor 40 for determining and regulating the average liquid temperature reached then follows downstream of the second electrical terminal 32, which is followed further downstream by a fourth temperature sensor 42 with which the maximum limit value of the average liquid temperature can be monitored. All of these sensors are coupled to the outer wall of the heating tube 10 under spring loading for temperature measurement.
  • a fifth temperature sensor 44 is also provided in the control unit 24, with which the ambient temperature in the immediate vicinity of the third and fourth temperature sensors 40, 42 can be determined, which is then used to correct measurement errors.
  • FIG. 3 shows a block diagram of a control device 50, which essentially consists of an operating system 52 and a protection system 54, which are usually each formed by a microprocessor, which monitor one another via a common line 56.
  • the operating system 52 and the protection system 54 are also connected to an input and computing unit 58.
  • the first, third and fifth temperature sensors 28, 40, 44 are each connected to the operating system 52 via a line 60, 64 and 68. Furthermore, the second and fourth temperature sensors 38 and 42 are connected to the protection system 54 via lines 70 and 72 and likewise give their values to this from. Furthermore, the second and fourth temperature sensors 38 and 42 can be determined by the operating system 52 via lines 74 and 76 via the fixed alarm value, so that the protection system 54 can check the second and fourth temperature sensors 38 and 42 in the event of an initial test.
  • the control device 50 furthermore has a power control unit 78 in which the electrical energy to be fed into the heating tube 10 is made available.
  • This power control unit 78 is connected to the operating system 52 via a control line 80, via which the activation signal is emitted.
  • the power control unit 78 is connected via a further control line 82 to the control part 52 and the protection system 54, via which the deactivation command is issued.
  • Operating system 52 is also connected via line 84 to a terminal test device. This initially checks the quality of the electrical connection using the contact pins. The result of the test is communicated to the protection system 54 via the data line 90.
  • two switch-off lines 86 and 88 are provided between the protection system 54 and the power control unit 78, with which relays for switching off the current flow in the event of a fault are activated.
  • the heating tube 10 is connected to the power control unit 78 by means of the electrical terminals 30, 32.
  • the supply voltage is coupled to the heating tube 10 with low contact resistances.
  • the entire secondary circuit is implemented in the power control unit 78 as a floating application part.
  • the heating power in the power control unit 78 is controlled according to the principle of full-wave control.
  • the required power is set using the ratio of the on and off times.
  • the network-synchronous switch-on time is always an integral multiple of 20 ms.
  • the operating system provided for the power control as the control part 52 processes the temperature values of the temperature sensors according to a predetermined program in addition to the current flow rate, which can be input via the input unit 58 or which can be transmitted by a flow sensor (not shown), the limit sensors 38 and 42 ensuring safe operation the heater.
  • the signal from the fifth temperature sensor 44 is additionally processed by the control part 52.
  • the protection system 54 occurs among other things. then in force when the limit values of the temperature sensors 38 and / or 40 are exceeded, the locking lever of the operating unit is actuated or unauthorized control commands are entered via the interface 58.
  • the protection system 54 brings the entire arrangement into the safe state, with all energy sources being disconnected from the heating tube 10.
  • liquids to be applied can be safely and quickly heated to the desired temperature in different flow rates.

Landscapes

  • Health & Medical Sciences (AREA)
  • Hematology (AREA)
  • Animal Behavior & Ethology (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
  • External Artificial Organs (AREA)
EP92101774A 1991-02-23 1992-02-04 Vorrichtung zum Erwärmen von medizinischen Flüssigkeiten Expired - Lifetime EP0501179B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4105781 1991-02-23
DE4105781A DE4105781C1 (enrdf_load_stackoverflow) 1991-02-23 1991-02-23

Publications (2)

Publication Number Publication Date
EP0501179A1 EP0501179A1 (de) 1992-09-02
EP0501179B1 true EP0501179B1 (de) 1995-08-09

Family

ID=6425777

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92101774A Expired - Lifetime EP0501179B1 (de) 1991-02-23 1992-02-04 Vorrichtung zum Erwärmen von medizinischen Flüssigkeiten

Country Status (3)

Country Link
EP (1) EP0501179B1 (enrdf_load_stackoverflow)
DE (2) DE4105781C1 (enrdf_load_stackoverflow)
ES (1) ES2075484T3 (enrdf_load_stackoverflow)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9216749U1 (de) * 1992-12-09 1994-04-07 Skubella, Ulrich, Dr.med., 34560 Fritzlar Vorrichtung zum Anwärmen von Infusionslösungen
DE4420493A1 (de) * 1994-06-12 1995-12-14 Ego Elektro Blanc & Fischer Elektronisches Durchflußheizelement für Medien
DE102007021406A1 (de) * 2007-05-04 2008-11-06 Werner-Alfons Litterst Temperiertasche
CA3063324A1 (en) 2017-05-16 2018-11-22 Bhami's Research Laboratory, Pvt. Ltd. High concentration protein formulations with reduced viscosity

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4098123A (en) * 1977-01-24 1978-07-04 Baxter Travenol Laboratories, Inc. Method and apparatus for measuring the operating temperature of blood warming apparatus
DE3545338A1 (de) * 1984-09-21 1987-07-02 Stihler Medizintechnik Gmbh Geraet zum anwaermen von infusions- und transfusionsloesungen
DE3606930A1 (de) * 1984-09-21 1987-09-10 Stihler Medizintechnik Gmbh Geraet zum anwaermen von infusions- und transfusionsloesungen
HU196265B (en) * 1986-04-11 1988-10-28 Rolitron Mueszaki Fejlesztoe K Method and apparatus for producing flow of wanted temperature of a physiological solution, as well as temperature control method and a heating device for the previously mentioned method and apparatus
US4759749A (en) * 1986-05-27 1988-07-26 Level 1 Technologies, Inc. Heater for physiological fluids
IL93093A (en) * 1989-01-19 1994-11-11 Norman James Manley Fast injection facility

Also Published As

Publication number Publication date
EP0501179A1 (de) 1992-09-02
DE4105781C1 (enrdf_load_stackoverflow) 1992-01-02
ES2075484T3 (es) 1995-10-01
DE59203151D1 (de) 1995-09-14

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